Button cell batteries like SR44 and LR44 are widely used across consumer electronics, industrial tools, and precision instruments. Despite their identical physical dimensions, their chemical composition and electrical performance differ significantly—making the wrong choice costly in sensitive applications.
This guide breaks down the technical, performance, and procurement differences between SR44 and LR44 batteries, helping engineers, buyers, and distributors make informed decisions.
Technical Overview of SR44 and LR44
SR44 and LR44 are both 11.6 mm in diameter and 5.4 mm in height, making them physically interchangeable in most devices. However, their internal chemistry defines their performance.
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SR44 Battery: Uses silver oxide (Ag₂O) chemistry
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LR44 Battery: Uses alkaline (Zn/MnO₂) chemistry
This distinction directly affects voltage stability, capacity, lifespan, and leakage behavior.
The key takeaway: same size does not mean same performance.
Comprehensive Cross Reference and Equivalent Table
The button battery market is notoriously confusing due to inconsistent naming conventions across brands and regions. Below is a consolidated cross-reference table to simplify sourcing and identification.
| Specification | SR44 | LR44 |
|---|---|---|
| Battery Type | Silver Oxide Button Cell | Alkaline Button Cell |
| IEC Code | SR44 | LR44 |
| Common Cross References | 357, 303, SR44W, SR44SW, S76, SG13, SR1154 | AG13, A76, L1154, LR1154, 157, G13A |
| Nominal Voltage | 1.55V | 1.5V |
| Typical Open-Circuit Voltage | 1.55V to 1.62V | 1.50V to 1.60V |
| Rated Capacity | 160–200 mAh | 110–130 mAh |
| Discharge Curve | Flat and stable voltage output | Gradual voltage decline during discharge |
| Internal Chemistry | Silver Oxide (Ag₂O) | Alkaline (Zn/MnO₂) |
| Diameter | 11.6 mm | 11.6 mm |
| Height | 5.4 mm | 5.4 mm |
| Weight | About 2.3–2.5 g | About 2.3–2.5 g |
| Temperature Performance | Better stability in a wider range of operating conditions | More sensitive to performance drop in demanding conditions |
| Shelf Life | 5–10 years | 2–3 years |
| Leakage Risk | Lower leakage risk, better long-term storage behavior | Higher leakage risk after deep discharge or long storage |
| Typical Applications | Digital calipers, watches, medical devices, precision meters | Toys, calculators, LED keychains, low-drain consumer devices |
| Interchangeability | Can usually replace LR44 in many devices | Not recommended to replace SR44 in precision equipment |
| Price Level | Higher | Lower |
| Packaging Options | Blister pack, shrink pack, bulk tray, OEM carton | Blister pack, shrink pack, bulk tray, OEM carton |
| Market Positioning | Premium performance battery | Economical general-purpose battery |
| Best Choice For | High-precision, long-life, stable-voltage applications | Cost-sensitive, low-power applications |
SR44 vs LR44 Voltage Stability Comparison
Voltage behavior is one of the most critical differentiators.
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SR44 (Silver Oxide) maintains a flat discharge curve, delivering a stable ~1.55V throughout most of its life.
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LR44 (Alkaline) exhibits a sloping discharge curve, with voltage gradually dropping from 1.5V.
Why it matters: Devices like digital calipers or medical instruments rely on stable voltage for accuracy. A declining voltage can cause:
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Measurement errors
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Display dimming
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Premature shutdown
Example: A digital micrometer powered by LR44 may start giving inconsistent readings long before the battery is fully depleted.
SR44 vs LR44 Battery Capacity Differences
Capacity directly impacts runtime.
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SR44: Typically 160–200 mAh
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LR44: Typically 110–130 mAh
This means SR44 can deliver up to 50–70% more usable energy.
The higher energy density of silver oxide chemistry allows SR44 batteries to sustain performance under stable voltage conditions, making them ideal for continuous-use devices.
SR44 vs LR44 Expected Lifespan Evaluation
Lifespan includes both operational life and shelf life.
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SR44 Shelf Life: 5–10 years
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LR44 Shelf Life: 2–3 years
In real-world usage:
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SR44 lasts longer due to stable voltage and higher capacity
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LR44 may require frequent replacement, especially in moderate-drain devices
For distributors or OEMs, this directly affects inventory turnover and product reliability.
SR44 vs LR44 Leakage Risk Assessment
Leakage is a major risk in button cells, especially in long-term installations.
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SR44 batteries are engineered with better sealing and lower internal pressure, reducing leakage risk.
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LR44 batteries are more prone to leakage, particularly when:
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Fully discharged
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Stored in high temperatures
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Left inside devices for extended periods
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Leaked alkaline electrolyte can corrode contacts and permanently damage electronics.
Example: LR44 leakage in a laser pointer or toy can render the device unusable, while SR44 significantly reduces this risk.
SR44 vs LR44 Manufacturing Cost Analysis
The price gap between SR44 and LR44 is not just a branding issue. It comes from a combination of raw material cost, manufacturing complexity, quality control requirements, and end-use positioning.
LR44 Battery:
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Uses alkaline chemistry (Zn/MnO₂), which relies on cheaper, commodity-grade materials
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Has a simpler manufacturing process with lower raw material expense
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Is optimized for low-cost, low-drain applications where the lowest unit price is the priority
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Benefits from broader commodity positioning, making it easier and cheaper to produce at scale
SR44 Battery:
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Uses silver oxide chemistry (Ag₂O), and silver is inherently more expensive than alkaline materials, creating a higher base cost
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Must deliver a flatter discharge curve, better voltage stability, and longer shelf life, which requires tighter process control and more consistent electrochemical performance
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Is typically sold for precision applications such as watches, calipers, medical instruments, and other sensitive devices
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Requires stricter quality standards, lower leakage risk, and more stable batch-to-batch output, which increases testing, inspection, and rejection costs during manufacturing
SR44 vs LR44 Ideal Application Scenarios
Choosing the right battery depends on device sensitivity.
SR44 Recommended For:
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Digital calipers and micrometers
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Watches (especially analog quartz)
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Medical devices
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Cameras and sensors
LR44 Suitable For:
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Toys
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LED keychains
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Calculators
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Low-cost consumer gadgets
A simple rule: If voltage stability matters, use SR44.
Assessing Total Cost of Ownership for Bulk Procurement
When you move from buying a single battery to stocking hundreds or thousands, the decision shifts from “which one is cheaper right now” to “which one costs less over time.” For distributors, OEMs, and technical buyers, this is where total cost of ownership becomes the real metric.
LR44 batteries have a lower unit price, which looks attractive on the purchase order. However, their shorter operational life and shorter shelf life mean more frequent replacements and a higher chance of inventory aging. In many use cases, LR44 may need to be replaced twice as often as SR44, and the cost of labor, downtime, and customer complaints can quickly outweigh the initial savings.
SR44 batteries, while more expensive per unit, deliver longer service life, a flatter voltage curve, and a shelf life of 5–10 years. This means:
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Less frequent battery replacements in precision devices
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Lower risk of performance issues tied to voltage drop
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Reduced inventory waste from batteries that age out before use
For companies that stock button cells as part of their regular supply, these factors directly affect profitability and customer satisfaction.
At Vigor Components, we help buyers make this trade-off more clearly. Our team focuses on delivering high-quality SR44 and LR44 cells with consistent performance, reliable packaging options, and transparent lead times. Whether you need blister packs for retail or bulk trays for production lines, we can match your procurement needs with batteries that balance cost and reliability.
In practice, the best choice depends on your application:
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For high-precision or long-life equipment (calipers, watches, medical devices), SR44 is often the more cost-effective option over time.
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For low-drain, cost-sensitive consumer products (toys, LED keychains, calculators), LR44 can be the right choice as long as replacement frequency is acceptable.
By looking at total cost instead of just unit price, you can avoid hidden expenses from frequent replacements, device failures, and inventory waste—making your bulk procurement more efficient and predictable in the long run.
Simple Ways to Spot Fake Silver Oxide Cells
Counterfeit or mislabeled batteries are common in the supply chain. Some LR44 batteries are falsely marketed as SR44 equivalents.
Here are practical inspection methods:
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Measure Open-Circuit Voltage
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SR44: typically ~1.55V–1.60V
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LR44: typically ~1.50V or lower
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Check Discharge Behavior
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A quick voltage drop under load suggests alkaline chemistry
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Verify Markings and Packaging
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Look for trusted brands and clear labeling (e.g., “Silver Oxide”)
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Use a Multimeter Under Load
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True SR44 maintains stable voltage
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Fake or LR44 substitutes show noticeable decline
FAQs
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Are SR44 and LR44 the same battery?
No. SR44 is a silver oxide button cell and LR44 is an alkaline button cell, but they share the same 11.6 mm × 5.4 mm size and similar voltage. -
Are SR44 and LR44 fully interchangeable in all devices?
They are physically interchangeable, but SR44 is recommended for precision or long‑life devices because it offers a flatter discharge curve, higher capacity and longer shelf life than LR44. -
Are LR44 batteries the same as 357 batteries?
They are the same size and can often be used in the same devices, but 357 is a silver oxide type (similar to SR44), so it usually lasts longer and keeps a more stable voltage than an alkaline LR44. -
Is LR44 the same as AG13 or A76?
Yes. LR44, AG13 and A76 are common equivalent codes for the same size alkaline button cell; you can usually treat them as interchangeable if the voltage and chemistry match the datasheet. -
When should I choose SR44 instead of LR44?
Choose SR44 for digital calipers, watches, medical devices and other precision instruments where stable voltage, longer runtime and lower leakage risk are more important than the lowest unit price.